Science Projects And Inventions

YOU NEED:

• A coke bottle
• Uncooked rice
• A pencil

Use the uncooked rice to fill a coke bottle tightly.

Insert a pencil, a chopstick, or a rod along the neck of the bottle neck into the rice.

You will find that when you lift the pencil, the bottle comes with it!

Chances are that you may need to try several times before it sticks in the rice.

Give the pencil a twist and you will be able to remove it from the rice with ease.

This trick will work with any bottle or container as long as its opening has a smaller circumference like the

coke bottle.

The trick is of Indian origin where fakirs are known to push in a dagger into a bowl of rice.

They then lift the knife with the bowl hanging from the dagger point.

dagger point.                                    

HOW DOES IT WORK?

The explanation is much the same as that of the experiment titled Distributed Pressure (refer to the contents).

The force introduced by the pencil is distributed among the packed rice grains.

They perforce press firmly both against the pencil and the sides of the bottle. Once you twist the pencil, the

forces break. It allows the pencil to move out freely.

FOOD FOR THOUGHT

 By seeing the clouds one can tell what the weather will be- Clouds are of three kinds. Stratus clouds  are flat, Cirrus clouds are like feathers. Cumulus  clouds are like bundles of the finest wool heaped.

 There are other clouds which are a mixture of all these.

Low and grey stratus clouds which cover the sky herald dull weather or bring rain if they are dark.

Even bright cumulus clouds sometimes become dark and bring rain. Sometimes they grow very big and bring in a thunder storm.

Cirrus clouds sometimes resemble horses tails so they are called "mares' tails". They are very high up and so they contain ice particles. When you see cirrus clouds you should know that the weather is changing.